Refitting

1. Remove the tappet retaining tool.

- Remove the hydraulic tappets from their housings.

- Fit the head support tool.

- Position the camshaft housing in a vice.

1. Using a dial gauge and magnetic base, check that the exhaust side camshaft end float is within the prescribed values.

If the exhaust side camshaft end float is not within the prescribed limits, replace the camshaft housing.

- Undo the screws loosened previously and remove the camshaft idler gears.

1. Remove the tapered plugs.

- Rotate the camshaft housing through 180°.

1. Undo the screws (1a) and remove intake side camshaft protective cover (1b), complete with O-ring.

2. Remove the exhaust side camshaft oil seal.

3. Undo the tapered plug, timing side.

- Release the camshafts.

Removing

- Check that the diameter of the camshaft journals and the cam lift correspond to the prescribed figures.

The surfaces of the cams and the pins should not show signs of wear, grooves or seizing. If this is not the case, replace the camshafts.

- Place the camshafts in their housings.

- Undo the plugs and fit the camshaft centering pins.

1. Fit a new oil seal on the exhaust side camshaft using the tool.

- Fit the inlet side camshaft protective cover in place, complete with a new O-ring and secure it using the screws.

- Rotate the camshaft housing through 180°.

- Fit the tapered plugs in their seats and tighten them to the prescribed torque checking that the maximum projection is 1 mm.

- Place the camshaft idler gears in position and fasten the screws without tightening them to torque.

Firstly, fit the exhaust side gear; then fit the intake side gear, aligning the (inner and outer) teeth until they are matched with the teeth on the exhaust side gear.

- Remove the camshaft housing from the vice and separate it from the support tool.

- Place the hydraulic tappets in their housings and fit the retaining tool.